JPH0820156B2 - Cooling system - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a cooling device which can save driving energy of a cooling medium pump by preventing a cooling medium from flowing unnecessarily to a heat exchanger. Is.

[Prior Art] An example of a conventional cooling system for an engine room is shown in FIG. 5, in which a cooling medium such as seawater discharged from a cooling medium pump a is sent to a heat exchanger c through a cooling medium pipe b. On the other hand, the cooling medium such as fresh water or oil is sent to the heat exchanger c through the cooling medium pipe d, and is cooled by exchanging heat with the cooling medium.
The cooled medium to be cooled is circulated to the main machine, and the cooling medium is discharged to the outside.

In the above cooling system, a constant amount of the cooling medium is always supplied from the cooling medium pump a to the heat exchanger c regardless of the temperature change of the cooling medium and the load fluctuation of the medium to be cooled. Temperature detector e provided in the cooling medium pipe d
Detects the temperature of the cooled medium, adjusts the opening of the temperature control valve f based on the temperature, and determines the flow rate of the cooled medium sent to the heat exchanger c and the flow rate of the cooled medium passing through the bypass pipe g. The temperature of the medium to be cooled is controlled and adjusted.

[Problems to be Solved by the Invention] However, generally, if the temperature of the cooling medium becomes low or the load of the cooled medium decreases, the amount of the cooling medium may be small. Since the amount of the cooling medium discharged from the cooling medium pump a is always constant and the flow rate cannot be adjusted by adjusting the amount of passage to the heat exchanger, the driving energy of the cooling medium pump is wasteful.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and aims to save driving energy for a cooling medium pump.

[Means for Solving Problems] The present invention relates to a device which is provided between a cooling medium pump and a heat exchanger and which controls the cooling medium pressure to be substantially constant, and which is cooled by the heat exchanger. A temperature control valve for controlling the flow rate of the cooling medium flowing into the heat exchanger or the flow rate of the cooling medium flowing out of the heat exchanger based on the temperature of the cooling medium flowing out of the heat exchanger. There is.

[Operation] The opening of the temperature control valve through which the cooling medium flows is controlled based on the temperature of the cooling medium flowing out of the heat exchanger, and the cooling medium is supplied to the heat exchanger at a flow rate corresponding to the temperature of the cooling medium. It

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an embodiment of the present invention, in which 1 is a cooling medium pump for sucking and pressurizing a cooling medium such as seawater through a suction pipe 2 and discharging it, and 3 is a cooling medium discharged from the cooling medium pump 1. Is a head tank for storing the cooling medium fed from the cooling medium pipe 3, and 5 is branched and arranged in parallel to distribute the cooling medium from the head tank 4. A plurality of cooling medium pipes, 6 is a heat exchanger connected to each cooling medium pipe 5, 7 is a cooling medium pipe for feeding the cooling medium discharged from the heat exchanger 6, and 8 is a heat exchanger 6 from the main engine. Cooled medium pipe for feeding a cooled medium such as fresh water or oil, 9 is a cooled medium pipe for feeding the cooled medium cooled by the heat exchanger 6 to the main machine, and 10 is a side surface of the head tank 4. A pressure type liquid level detection device installed at the bottom, 11 is, for example, a pressure type liquid level detection device. A transmission line which is detected by the output device 10 and gives an ON / OFF command signal to the cooling medium pump 1 by the liquid level of the cooling medium, 12 is a temperature detector provided in the cooling medium pipe 9, and 13 is attached to the cooling medium pipe 7. The temperature control valve 14 is a transmission line that gives a command signal for opening and closing the temperature control valve 13 according to the temperature of the medium to be cooled detected by the temperature detector 12.

The cooling medium fed by the cooling medium pump 1 through the cooling medium pipe 3 is stored in the head tank 4, and when the liquid level of the cooling medium in the head tank 4 reaches the upper limit, the liquid level detection device
The signal detected at 10 is sent from the transmission line 11 to the cooling medium pump 1, and the cooling medium pump 1 is stopped.

The cooling medium sent from the main machine is fed from the cooling medium pipe 8 to the heat exchanger 6 and by the cooling medium fed from the head tank 4 through the cooling medium pipe 5 to the heat exchanger 6. It is cooled and returned to the main engine through the cooled medium pipe 9. At this time, the temperature of the cooling medium flowing from the heat exchanger 6 into the cooling medium pipe 9 is detected by the temperature detector 12, and an opening command proportional to the temperature of the cooling medium is transmitted from the temperature detector 12. It is given to the temperature control valve 13 via the line 14, and the temperature control valve 13 is controlled to open and close in accordance with the opening command. Therefore, the flow rate of the cooling medium supplied from the head tank 4 to the heat exchanger 6 through the cooling medium pipe 5 is controlled by the temperature control valve 13.

For example, when the temperature of the cooling medium is lowered, the temperature of the cooling medium detected by the temperature detector 12 is determined as long as the flow rate of the cooling medium introduced from the cooled medium pipe 8 to the heat exchanger 6 does not change. Since the temperature falls below the predetermined temperature, the temperature control valve 13 is throttled and the flow rate of the cooling medium introduced from the cooling medium pipe 5 to the heat exchanger 6 becomes small. Further, even when the flow rate of the cooled medium introduced from the cooled medium pipe 8 to the heat exchanger 6 decreases, the temperature of the cooled medium detected by the temperature detector 12 falls below a predetermined temperature, so the temperature control valve 13 The flow rate of the cooling medium that is throttled and introduced into the heat exchanger 6 from the cooling medium pipe 5 is reduced.

When the cooling medium flows out from the head tank 4 into the cooling medium pipe 5, the liquid level of the cooling medium in the head tank 4 lowers, but when the liquid level reaches the lower limit, a command from the liquid level detection device 10 is sent via the transmission line 11. Is supplied to the cooling medium pump 1, the cooling medium pump 1 is driven, and the cooling medium is fed from the cooling medium pipe 3 to the head tank 4.

Further, when it is not necessary to cool the medium to be cooled, the cooling medium pump 1 is stopped as long as the liquid level of the cooling medium in the head tank 4 is above the lower limit.

As described above, since the cooling medium pump 1 is driven and stopped by the liquid level of the cooling medium in the head tank 4, the cooling medium pump 1 is not always driven,
Therefore, power is saved.

In order to adjust the liquid level of the head tank 4, the cooling medium pump 1 is turned on / off in the above-described embodiment, but the number of driven pumps may be controlled to control the number of pumps, or the pump rotation may be performed. A flow rate control may be performed to control the flow rate of the cooling medium discharged from the rotation speed control pump that controls the number.

FIG. 2 (a) shows another example of the means for detecting the liquid level of the cooling medium of the head tank 4 in FIG.
This is an example in which a, 15b, and 15c are provided. Even if such a detecting means is provided, the cooling medium pump 1 can perform not only the on / off control but also the number control, the rotation speed control, and the flow rate control according to the liquid level of the head tank 4.

2B shows another example of the means for detecting the liquid level of the cooling medium of the head tank 4 in FIG. 1, which is an example in which a purge type or magnet type liquid level detecting device 16 is provided. Even if such a detecting means is provided, the cooling medium pump 1 can perform on / off control, number control, rotation speed control, and flow rate control.

FIG. 3 shows another embodiment of the present invention, in which a pressure tank 17 is provided instead of the head tank 4, and a pressure detection device 18 such as a pressure switch is provided on the upper side of the pressure tank 17.

FIG. 4 shows still another embodiment of the present invention in which a pressure tank such as a head tank is not installed and a pressure detection device 18 such as a pressure switch is provided in the middle of the cooling medium pipe 3.

The cooling medium pump 1 may be arranged as shown in FIG. 3 or FIG.
It is possible to perform on / off control, unit number control, rotation number control, and flow rate control.

3 and 4 that are the same as those shown in FIG. 1 are the same.

In the embodiment of the present invention, the case where the temperature control valve is provided on the outlet side of the heat exchanger has been described. Of course, changes can be made.

[Effects of the Invention] According to the cooling device of the present invention, the cooling medium pump can adjust the flow rate of the cooling medium in response to load fluctuations without always operating the cooling medium pump. It is possible to achieve various excellent effects such as reduction of

[Brief description of drawings]

FIG. 1 is an illustration of an embodiment of the cooling device of the present invention, FIGS. 2 (a) and 2 (b) are illustrations of another example of the means for detecting the tank liquid level in FIG. 1, and FIG. FIG. 4 is an explanatory view of another embodiment of the cooling device of the present invention, FIG. 4 is an explanatory view of another embodiment of the cooling device of the present invention, and FIG. 5 is an explanatory view of a conventional cooling device. In the figure, 1 is a cooling medium pump, 3 is a cooling medium pipe, 4 is a head tank, 5 is a cooling medium pipe, 6 is a heat exchanger, 7 is a cooling medium pipe, 8 and 9 are cooling medium pipes, and 10 is a liquid surface. Detector, 1
2 is a temperature detector, 13 is a temperature control valve, 15a, 15b and 15c are float switches, 16 is a liquid level detection device, 17 is a pressure tank, and 18 is a pressure detection device.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Fumimaru Kitamoto 1-6-2 Marunouchi, Chiyoda-ku, Tokyo Ishi Kawashima Harima Heavy Industries, Ltd. Head Office Annex (72) Inventor Jioji Thomas Litchiardson Ki Yanbel Chuo-ku, Tokyo Shintomi 1-5, Shin-Chuo Building (Kyobashi), 8th floor (56) References JP-A-62-84277 (JP, A) JP-A-62-248976 (JP, A) Actual development Sho-61-118705 (JP, U) Actual development Sho 57-170594 (JP, U)

Claims (1)

[Claims] 1. A device provided between a cooling medium pump and a heat exchanger, for controlling the cooling medium pressure to be substantially constant,
A temperature for controlling the flow rate of the cooling medium flowing into the heat exchanger or the flow rate of the cooling medium flowing out of the heat exchanger based on the temperature of the cooling medium cooled by the heat exchanger and flowing out of the heat exchanger. A cooling device provided with a control valve.